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(CkPython) Send DKIM Signed Email
Demonstrates how to create a simple email, add a DKIM signature, and send it.
Note: Requires version 9.0.3 or greater.
import sys import chilkat # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # The mailman object is used for sending and receiving email. mailman = chilkat.CkMailMan() # The dkim object is used for creating the DKIM signature. dkim = chilkat.CkDkim() # Set the SMTP server. mailman.put_SmtpHost("smtp.chilkatsoft.com") # Set the SMTP login/password (if required) mailman.put_SmtpUsername("myLogin") mailman.put_SmtpPassword("myPassword") # Set the SmtpPort if your SMTP server uses an alternative port (default = 25) mailman.put_SmtpPort(587) # Create a new email object email = chilkat.CkEmail() email.put_Subject("This is a test") email.put_Body("This is a test") email.put_From("Chilkat Support <firstname.lastname@example.org>") # We'll send the email to a Yahoo email account. It is then # possible to view the full headers within the Yahoo email # interface to see if the DKIM signature was accepted. success = email.AddTo("Chilkat Software","email@example.com") success = email.AddTo("Chilkat Admin","firstname.lastname@example.org") # When sending an email with a DKIM signature, the MIME # of the email must not be modified (in significant ways) prior to # or during the sending process. Therefore, the MIME of the # email is assembled, the DKIM signature is added, and then # SendMimeBytes is called to send the email. # Get the MIME of the email. Calling RenderToMimeBytes # causes the email to be signed and/or encrypted if those options # have been selected. The MIME returned by RenderToMimeBytes # is the exact MIME that would've been sent if SendEmail was # called. We'll add a DKIM signature header to this MIME and then send... mimeData = chilkat.CkByteData() success = mailman.RenderToMimeBytes(email,mimeData) if (success != True): print(mailman.lastErrorText()) sys.exit() # To create a DKIM signature for email (i.e. MIME), # you'll need to provide the following: # (1) An RSA private key in any common file format. # (2) The domain name (typically the same domain # as the sender of an email). # (3) A selector for the domain name -- an arbitrary string # to identify the matching public key in DNS. # To allow an email recipient to verify the DKIM signature via an # external email client supporting DKIM or using other software, # you will need to create a DNS record with the selector # and matching public key. This example does not provide # information about DKIM DNS record creation. # (Chilkat does not provide an API for creating DNS records. # Creating the DKIM DNS record is something you would do # manually.) # Set the domain and selector: # You'll need to provide your own values here.. dkim.put_DkimDomain("chilkatsoft.com") dkim.put_DkimSelector("brisbane") # Load a private key from any common RSA private key # format, such as DER, PKCS8, PEM, XML, etc. # The LoadDkimPkFile method automatically detects # the file format and reads it appropriately. # If a password is not required, you'll still need to provide # a password string argument, but it is ignored. password = "optionalPassword" success = dkim.LoadDkimPkFile("myPrivateKey.pem",password) if (success != True): print(dkim.lastErrorText()) sys.exit() # Add the DKIM-Signature header and # returns the new MIME with DKIM-Signature added. dkimSignedMime = chilkat.CkByteData() success = dkim.AddDkimSignature(mimeData,dkimSignedMime) if (success != True): print(dkim.lastErrorText()) sys.exit() # Call SendMimeBytes to connect to the SMTP server and send. # The connection (i.e. session) to the SMTP server remains # open so that subsequent Send* calls may use the # same connection. strFrom = "email@example.com" # To send to multiple email addresses, the strTo should be set to a comma-separated # list of email addresses. strTo = "firstname.lastname@example.org, email@example.com" success = mailman.SendMimeBytes(strFrom,strTo,dkimSignedMime) if (success != True): print(mailman.lastErrorText()) sys.exit() # Some SMTP servers do not actually send the email until # the connection is closed. In these cases, it is necessary to # call CloseSmtpConnection for the mail to be sent. # Most SMTP servers send the email immediately, and it is # not required to close the connection. We'll close it here # for the example: success = mailman.CloseSmtpConnection() if (success != True): print("Connection to SMTP server not closed cleanly.") print("DKIM Signed Mail Sent!")
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